The Lothians MSP spoke out as she secured the backing of most grass-roots party groups in her bid to replace Jim Murphy. Thirty (88 per cent) Scottish constituency Labour parties (CLPs) - as well as four unions - are backing Ms Dugdale.

We need a big tent plan, not a core vote strategy, to win again in Scotland

Kezia Dugdale

She said today that Labour has been seen as too concerned with the vulnerable - and must now reach out to the vast majority of Scots who want to “better themselves.”

Ms Dugdale said today: “I am proud to have earned the support of 88 per cent of local Labour Party groups that have made supporting nominations, a number of trade unions and our student and youth wings.

“I have been able to reach out to the different sections of the Labour Party and now we must do the same with the country.

“If the history of our Party tells us anything it’s that we win elections by reaching out beyond our natural supporters.

“We need a big tent plan, not a core vote strategy, to win again in Scotland.”

Ms Dugdale faces competition from Eastwood MSP Ken Macintosh to replace Mr Murphy who quit in the aftermath of Labour’s election meltdown in May which saw the party win just one seat in Scotland.

And Ms Dugdale - who also has the backing of most MSPs - said Labour must now adopt a border appeal.

“Too often in the recent past it has looked like we are only on the side of one group of people – the most vulnerable in society, she added.

“Labour will always stand up for the weak and voiceless, but we also need to represent the vast majority who aren’t struggling but just want to do better for themselves.

She added: “In the recent past we haven’t looked like a Party on the side of those who want to get on in life. Under my leadership we will celebrate success – for individuals, families and communities all across this great nation of ours.”